Chuck.



PATENTED SEPT. 11, 190 W. W. DOOLITTLE.

CHUCK.

- APPLIOATION FILED AUG. 25, 1903..

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To all whom it may concern:

ILLIA w,-noon 1rTLn, oF onIoAeo, I LINOIS, ASSIGN'OR-TO CRANEGOMPANYQOR(nnoacognaauonaliooaronnrunrorittnuns .CHUCK Specification ofLetters Patent.

Patentedfiept. 11, 1906.

kpplicationfiled'kagust 25; 1903. Serial No; 170,666.

the articles in such machines The objects of the invention are,-toprovide 'a' -pn'eu-matic 'gripping'chuck, to provide a'series'of chucksso arranged that one can be in position for cooperation with the tappingtool while the other is in position to be simultaneously operated toengage or discharge an article to be tapped; to

provide automatic means for gripping the .ar-

ticle and presenting-it in properplace before the tapping toolto-provide a superior form of pivotally mounted jaw for a chuck and togenerally improve the construction and operation of tapping machines.The machine whichI have designed to attain these objects and otheradvantages which will hereinafter appear I illustrate in theaccompanying drawing, which shows a partial side elevation and partialvertical central section through a device built in accordance with myinvention.

' The form of the machine for moving thetapping tool and the form' ofthe said tool are immaterial. to this invention and may be made of anyordinarystnucture. As illustrated in the drawing the base 1and-stanchion 2 supports the horizontal driving shaft '3 driven by theusual pulleys and through a train of gears including the pinion 4, wheel5 pinion 6, gear 7 the'head 8 is revolved and carries thereon anydesired form of tap indicated diagrammatically at 9.

Mounted pivotally upon a trunnion 10 in two oppositely disposed upwardlyprojecting I parts of the base -1 is a two-ended arm 11 which carries atits opposite sides respectively gripping jaws so placed as to be in linewith the tapping tool 9 when in the position as shown in the drawing.The chucks are alike and are composed of a stationary jaw 12 and themovable arm carrying the movable jaw 13 mounted thereon so as to beadjusted with respect to 'he "same'bymeans of a screw 22 passing throughthe head 14 on the'a'rm 15; the said arm 15 being pivoted at 16 to themain arm 11. The'movable jaw is reciproo-ate'd'to open and close uponthe article placedltherin by means of the link 17 pivoted at one end tothe stationaryjaw and at the other to the link 18'which'- in turn ispivoted to the-movable arm 15-; thelinks 17 and 18 are operated andcontrolled through the medium of'a'link 18 pivoted'thereto and to aplunger 19 working in a cylinder 20 and operated by some ,fluid'pressure as compressed air which may be admitted through -a flexiblepipe and through the threeway cock'2l and operated by hand toalternately v admit and exhaust the same to move the jaw. It will beunderstood that while one of the chucks is. in position to co-operatewith the tapping tool 9 the other at the opposite side is free to bemanipulated to remove an article therefrom or place one therein, and theloosening and tightening of the gripping jaw is entirely controlled bymeans of the neumatic pressure admittedby the cock 21. In order touphold the chuck in proper position a notch 24 is provided "in the head12 and when in proper place co-operates with the dog 23 which is pivotedat 25 upon a bracket supported upon the base 1. A spring within thebracket may be used to hold the dog in place in the notch 24.

From the above description the operation of the device will be evident;and it will be seen that it presents a great advantage over the handoperated chucks which are ordi-.

narily in use in such machines, and that the use of fluid pressureenables any desired pressure to be exerted upon the article and to beexerted constantly while the article is being held in the chuck. Also itwill be seen that there is a great convenience in having the two chucksso arrangedthat one is in operative position while the other is openedor closed to introduce the new article. The air pressure being suppliedconveniently through flexible tubes connected to cocks 21 and fedvthrough a tube running through the center of the trunnion 10 as shown,the movement of the arm 11 and jaws is entirely free and the plungersmaybe operated'at any time and in any position desired. The conveniencesand advanta es of this apparatus will readily appear to t ose familiarwith tapping machines.

Having thus described my invention and illustrated its use, what I claimas new, and desireto secure by Letters Patent, is the following:

1. The combination of a revoluble chuck support, a series of chucksmounted thereon to revolve about a common center and into a position foroperation successively, and fluid pressure means carried upon the chucksupport for operating each one of said chucks.

2. The combination of a revoluble chuck support, a series of chucksmounted thereon, eac of said chucks comprising a fixed jaw, a

movable jaw and toggle link mechanism for operating the movab e jaw,together with independent means carried on each of the movable jaws tooperate the corresponding link.

3. A holding chuck comprising in combination a pivoted revoluble armhaving oppositely disposed jaws at each end, movable jaws pivotedthereto, toggle link mechanism for operating the movable jaws and meansfor operating said toggle link carried on the movable jaws.

4. The combination of a revolving chuck support and a series of armsthereon carrying chucks for holding articles, each of the chuckscomprising a fixed jaw and a movable jaw,

and toggle link mechanism for operating the' holding chucks for thearticles to be tapped,

'ea ch comprising a'pair of pivoted jaws, a

connecting link pivoted on one of said jaws, a toggle link connectedthereto and to the other jaw, a fluid pressure operated plun er androper connection to the toggle link or movlng it' and the movable jawwith multiplied power, mounted on the said jaw, and'a fluid pressureinlet to actuate the plunger through the common axis of all theI'GVOlYlIIg chucks.

. 6. The combination of a revoluble chuck support, a series of chucksmounted thereon, fluid pressure means carried upon the chuck su saichucks being adapted to be brought into position for operationsuccessively, together with means for locking the chucks in suchoperative position. 7

In testimony whereof I have hereunder signed my name in the presence ofthe two subscribed witnesses.

WILLIAM W. DOOLITTLE.

PAUL CARPENTER, OHAS. H. EBERT.

ort for operating each one of the chucks,

